Electrical fuse-plug.



No. 804,070. f PATENTED NOV. 7, 1905. G. B. THOMAS.

ELECTRICAL FUSE PLUG.

APPLIGATION FILED M122. 1905.

' INVENTOR ATTORNEYS WITNESSES UNITED srATnsgPArnNr OFFICE.

GEORGE B. THOMAS, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE BRYANT ELECTRIC COMPANY, OF BRIDGEPORT, CONNECTICUT, A COR- PORATION OF CONNECTICUT.

ELECTRICAL FUSE-PLUG.

Specification of Letters Patent.

Patented Nov. '7, 1905.

Application filed May Z2, 1905. Serial No. 261,604.

To @ZZ whom, i2? puny concern:

Be it known that I, GEORGE B. THOMAS, a citizen of the United States of America, residing in the city of Bridgeport, in the county 5 of Fairfield, in the State of Connecticut, have invented an Improved Electrical Fuse-Plug,

of which the following is a specification.

My invention relates to the thermal cutout plugs for electrical circuits, and particuio larly to that type of plug which is adapted to a fuse-plug of the above character which will be efficient in use and inexpensive to manufacture and more convenient than any heretofore made, one of the principal objects of my invention being to so construct the plug zo that the fuse-cartridge may be inserted or replaced without removing the entire plug from the branch block or receptacle, as will be hereinafter more fully described.

In the accompanying drawings, Figure I represents a vertical axial section of a fuseplug with a fuse therein embodying my invention, the cap being separated from the maincasing; and Fig. 2 is a plan view of the casing with the cap removed. Fig. 3 is a 3o view of the inner face of the cap.

A represents a casing of porcelain or other suitable insulating material, preferably in the form of a hollow cylinder adapted to be opened at one end for the admission of the fuse-cartrid ge and closed at the other end by the contact-terminals of the plug. If the plug is of the familiar form, having a threaded terminal adapted to 'fit a socket and a central contact-terminal, the closed end is made 4o of the proper size to receive on its outside the usual external threaded ring T, as shown in the drawings. The terminal ring is electrically connected by solder or otherwise to the extended lower ends c of sockets C, which are 4 5 set in openings in the side walls of the casing A and are open at the upper or open end of the casing. These sockets are preferably split at their open ends, as shown. The casing, which is of cylindrical shape, has a cen- 5o tral chamber B, preferably cylindrical and slightly larger than the fuse-cartridge D to be inserted therein. At the lower end of the chamber B is a spring clip-piece P, having a plurality of legs p, in this case four, adapted to mechanically engage the metallic end of the fuse-cartridge D and be in electrical contact therewith as well. This clip-piece is secured to the casing by any suitable means, such as the rivet R, which passes through the centralpart of the closed end of the casing and forms the central terminal of the plug. The open end of the casing is provided with a cap E, which is preferably slightly hollowed on its inner face and has a central recess F, in which is secured a clip P, similar to the clip P in the casing, except that the clip in the cap is provided with more or stronger grasping-legs jp to engage the upper end of the fuse-cartridge D, so that the clip P within the casing will yield sooner than the clip P/ within the cap, and therefore when the cap is removed the fuse will come ofll with the cap for ready inspection and renewal. The clip I3 has laterally-extending legs p2 in electrical connection with pins p3, which are adapted to enter the split spring-sockets C C. These pins p3 may be mechanically secured to the cap by screws s, which may also serve to secure the clip-piece p.

I claim as my invention- 1. In a fuse-plug for fuse-cartridges, an insulating-casing carrying external contactterminals, and a clip-piece secured to the inner end of said casing, adapted to engage a fuse-cartridge, in combination with a cap to cover the end of said casing, and means therein adapted to remove said fuse from the casing when the cap is removed.

2. In a fuse-plug for fuse-cartridges, an insulating-casing carrying external contactterminals and means secured to the inner end of said casing adapted to engage a fuse-cartridge, in combination with a cap to cover the end of said casing, and means in said cap to engage said fuse-cartridge, said engaging means in the cap being the stronger.

3. In a fuse-plug for fuse-cartridges, an insulating-casing carrying an external terminal ring, and a clip-piece secured to the inner end of said casing adapted to engage one end of a fuse-cartridge, in combination with a cap to fit over said casing and a clip-piece in the cap to engage the opposite end of said cartridge, said second clip being stronger than said first clip.

4. In a fuse-plug for fuse-c artridges, an in- IOO IOS

the cartridge and remove the same when said Cap is removed and means whereby said clip is electrically Connected to one of said termi- 15 nals, when the cap is put in place.

In testimony whereof I have signed my name t0 this specification in the presence of two subscribing witnesses.

GEORGE B. THOMAS. Iitnesses G. W. GooDRIDe-E7 II. W'. GOLDSBOROUGH. 

